Neutrophils circulate in the blood in a resting state, with what researchers call an “arsenal of prepackaged cytosolic granules,” which are subcellular compartments adorned with anti-microbial glycoproteins. These subcellular compartments are mobilized under specific environmental cues, allowing the neutrophils to move to where they are needed and react as needed for that specific threat.
To understand how the neutrophils deploy the correct course of action, the researchers first isolated neutrophils from human blood donors. From the neutrophils, the researchers isolated the intracellular cytosolic granules. They then comprehensively profiled the entire complement of glycan-decorated proteins from these compartments. By analyzing four key types of intracellular organelles in neutrophils across the cells’ maturation stages from bone marrow to blood, the researchers could map how, when and where the neutrophil proteins present glycans to combat microbes and carry out other key inflammatory processes.
The first line of defense in our immune systems are white blood cells, 40% to 70% of which are neutrophils. These cells rush to sites of inj